Tonight from turkey, new clues into the death of that american mother on a trip texting her husband and children photos. Her last text saying she'd be home the next day. Last night here we told you about the gruesome discovery. Tonight nick schifrin with more on the investigation from turk turkey. Reporter:33-year-old sarai sierra is dead. But the mysteries in her case remain unsolved. Today plainclothes detectives scoured for clues. She died from a blow to the head, but they don't know who killed her or why. Her body was found in those trees right behind me. You can see the police are still here. This is a pretty isolated area. On this side there's a drop-off, on this side a train track. The theory is she was killed somewhere else and her body brought here. Police are combing through hundreds of hours of surveillance video. This is the last time she was seen walking through a mall one day before she was due home. She stayed in this basement apartment, it's a mostly working class neighborhood. One of the intriguing mysteries to this case is why would she leave her cell phone, medical records, even her passport behind in her room. Police say she didn't get caught up in drugs or trafficking and are questioning at least 11 suspects. Sarai exchanged e-mails with one of those suspects the day she vanished, but he's been released. So police along with the fbi continue to comb through every clue in a case that very much is still open.

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